Three discs A, B and C having radii 2 m, 4 m and 6 m respectively are coated with carbon black on their outer surfaces. - The wavelengths corresponding to maximum intensity are 300 nm, 400 nm and 500 nm respectively. The power radiated by them are QA , QB and QC respectively:

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QA is maximum

QB is maximum

QC is maximum

QA = QB = QC

answer is B.

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Detailed Solution

∴λmT=b and Q=σAT4 ∴Q∞Aλm4

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